noaa-fire-18097 Heyerdahl fire data from Potholes, central Oregon - IMPD USPOT002 Heyerdahl, E.K.; Falk, D.A.; Loehman, R.A. Heyerdahl fire data from Potholes, central Oregon - IMPD USPOT002 2015-02-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18097 Investigator E.K. Heyerdahl Investigator D.A. Falk Investigator R.A. Loehman earth science paleoclimate fire history|tree ring tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,FHX2 data format; refer to IMPD documentation for description of codes earth science paleoclimate sample identification,null,null,null,null,,null,null,C,Tree ID earth science paleoclimate fire history|tree ring age,null,null,null,null,fire history|tree ring,null,null,N,null earth science paleoclimate fire history|tree ring tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,null earth science paleoclimate fire history fire scar dates earth science paleoclimate fire history establishment dates geoscientificInformation PIPO Pinus ponderosa Douglas ex C. Lawson ponderosa pine western yellow pine PICO Pinus contorta Douglas ex Loudon lodgepole pine 1490 AD 2009 AD 460 cal yr BP -59 cal yr BP Complete 43.730972 43.730972 -120.942639 -120.942639 1486 1486 Continent North America United States Of America Oregon Potholes>LATITUDE 43.730972>LONGITUDE -120.942639 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Heyerdahl, E.K., R.A. Loehman, D.A. Falk 2014 Canadian Journal of Forest Research 44 593-603 doi 10.1139/cjfr-2013-0413

In parts of central Oregon, coarse-textured pumice substrates limit forest composition to low-density lodgepole pine (Pinus contorta Douglas ex Loudon var. latifolia Engelm. ex S. Watson) with scattered ponderosa pine (Pinus ponderosa Lawson & C. Lawson) and a shrub understory dominated by antelope bitterbrush (Purshia tridentata (Pursh) DC.). We reconstructed the historical fire regime from tree rings and simulated fire behavior over 783 hectares of this forest type. For centuries (1650-1900), extensive mixed-severity fires occurred every 26 to 82 years, creating a multi-aged forest and shrub mosaic. Simulation modeling suggests that the historical mix of surface and passive crown fire were primarily driven by shrub biomass and wind speed. However, a century of fire exclusion has reduced the potential for the high-severity patches of fire that were common historically, likely by reducing bitterbrush cover, the primary ladder fuel. This reduced shrub cover is likely to persist until fire or insects create new canopy gaps. Crown fire potential may increase even with current fuel loadings if the climate predicted for mid-century lowers fuel moistures, but only under rare extreme winds. This study expands our emerging understanding of complexity in the disturbance dynamics of lodgepole pine across its broad North American range. STUDY NOTES: This site was sampled as part of a project to reconstruct historical fire regimes in central Oregon. Ring-boundary fire scars were assigned to the preceding calendar year. Several metadata files are provided with the FHX file. -999 in any file indicates no data. Ring-boundary fire scars were assigned to the preceding calendar year. Several metadata files are provided with the FHX file. -999 in any file indicates no data. Four supplemental information files are located at URL - http://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/ : (1) uspot002-plot-data.csv provides information on the plots. (2) uspot002-saplings.csv provides information on small trees that we did not attempt to remove wood samples from. These trees were tallied in each plot by species and diameter class (measured at breast height, 1.4 m) in 5.6-m radius plots. Diameter classes: 2.5 (0-5 cm), 7.5 (5-10 cm), 15 (10-20 cm). (3) uspot002-scarred-tree-info.csv provides information on fire-scarred trees, including ones we also sampled for recruitment date. (4) uspot002-undatable-trees.csv provides information on trees from which it did not appear that we could obtain intact wood samples.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/uspot002.fhx Fire Scar Data; uspot002.fhx GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/uspot002-fire-hist-graph.pdf Fire History Graph; uspot002-fire-hist-graph.pdf GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/uspot002-undatable-trees.csv Supplemental Data; uspot002-undatable-trees.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/establishment/northamerica/uspot002.dat Establishment Data; uspot002.dat GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/uspot002.txt More Information; uspot002.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/uspot002-scarred-tree-info.csv Supplemental Data; uspot002-scarred-tree-info.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/uspot002-saplings.csv Supplemental Data; uspot002-saplings.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/uspot002-fire-hist-graph.png Fire History Graph; uspot002-fire-hist-graph.png GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/uspot002-plot-data.csv Supplemental Data; uspot002-plot-data.csv USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11